3(S)-(tert-Butoxyformamido)-2(S)-hydroxy-4-phenyl-1-butanal

4(S)-(1(S)-Azido-2-phenylethyl)-1,3,2-dioxathiolane 2,2-dioxide

3(S)-(Benzyloxyformamido)-1-bromo-4-phenyl-2(S)-butanol

4(S)-Benzyl-3-(tert-butoxycarbonyl)-2,2-dimethyl-5(R)-oxazolidineacetic acid chloride

4(S)-Benzyl-3-(tert-butoxycarbonyl)-2,2-dimethyl-5(R)-oxazolidineacetic acid